Overview - What ISO 13373-10:2024 covers
ISO 13373-10:2024 - part of the ISO 13373 series on vibration condition monitoring - provides guidelines and requirements for performing vibration diagnostics on 2‑ and 4‑pole electrical generators of cylindrical pole design with fluid‑film bearings. It establishes a practical, step‑by‑step, vibration‑based approach to fault diagnosis (using flowcharts, fault and symptom tables) and is intended for vibration practitioners, engineers and technicians. This document does not apply to salient pole generators and should be used together with ISO 13373‑4.
Key technical topics and requirements
- Scope and applicability: Focus on 2‑ and 4‑pole cylindrical pole electrical generators with fluid‑film bearings; excludes salient pole machines.
- Measurement guidance: Use of appropriate transducers - non‑contacting probes (inductive, capacitive, eddy current) for rotating shafts and seismic transducers (accelerometers, velocity transducers) on stationary housings. Consider grounding/earthing and electromagnetic fields before measuring.
- Operational data: Capture machine parameters (rotational speed, load, mounting configuration, temperature) because they affect vibration signatures.
- Initial analysis: Follow ISO 13373‑3 guidance to assess vibration severity, safety concerns, historical trends, mounting/environment factors and need for shutdown.
- Specific diagnostic tools: Annex A (fault tables), Annex B (diagnostic methodology/flowcharts) and Annex C (fault examples). Symptom tables identify distinguishing vibration features; fault tables list prevalent generator defects.
- Generator‑specific phenomena: Inherent 2× vibration is normal in 2‑pole (and some 4‑pole) designs due to electromagnetic excitation; 2× line frequency (100/120 Hz) can excite structural resonances and may be hard to separate from rotational effects.
- Common faults noted: Rotor transient bend from shorted turns is highlighted as a frequent cause of elevated vibration; specialized electrical and thermal tests (referenced in the literature) support diagnosis.
- Considerations for corrective action: Weigh safety, commercial impact, design/assembly issues and confidence in the diagnosis before recommending interventions.
Practical applications and users
- Who uses it: Vibration analysts, condition monitoring teams, reliability engineers, commissioning engineers and service providers for large rotating electrical generators.
- When to use: Predictive maintenance programs, post‑anomaly root cause analysis, commissioning checks, and troubleshooting of elevated or erratic vibration on generators with fluid‑film bearings.
- Benefits: Standardized, field‑practical workflow (flowcharts + tables) improves diagnostic consistency, reduces misdiagnosis, and helps prioritize corrective actions.
Related standards and references
- ISO 13373‑1, ISO 13373‑2, ISO 13373‑3 (series on vibration monitoring and diagnostic techniques)
- ISO 13373‑4 (to be considered with this document)
- ISO 20816 (vibration severity assessment for turbines and generators)
- IEC/TS 60034‑32 (end‑winding/core vibration monitoring guidance)
Keywords: ISO 13373-10:2024, vibration condition monitoring, diagnostics, electrical generators, fluid-film bearings, 2‑pole generators, rotor diagnostics, fault tables, symptom tables.